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US 5,460,233 AGranted
Diamond cutting structure for drilling hard subterranean formations
AssigneeBaker Hughes Incorporated
InventorsNigel C. Meany, Craig H. Cooley, Gordon A. Tibbitts
Life of this patent
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Abstract
A rotary drag bit for drilling hard rock formations with substantially planar PDC cutting elements having diamond tables backed by substrates which flare or taper laterally outwardly and rearwardly of the cutting edge of the diamond table. A cutting structure defining a "lipped" cutting edge is also disclosed.
Claims33
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising:
- a shank;
- a bit crown secured to said shank and having a face opposite thereto;
- and
- at least one superhard cutting element secured to said crown face;
- said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate being no greater than that of said superhard table proximate said cutting edge and extending laterally outwardly and rearwardly behind said cutting edge.
2 more elements
A cutting element for a rotary drag bit used in drilling subterranean formations, comprising:
- a substantially planar table of superhard material having a cutting edge;
- and
- a substrate behind and supporting said superhard table and including at least a portion having a smaller lateral extent than said superhard table so as to define a lip associated with said cutting edge, said substrate flaring or tapering outwardly and rearwardly from said cutting edge.
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table having a cutting surface on one side thereof and a rounded cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table being of nonuniform thickness and having a cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table having a convex cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table having a ridged cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of no greater lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge as said substrate extends rearwardly from said superhard table.
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising:
- a shank;
- a bit crown secured to said shank and having a face opposite thereto;
- and
- at least one superhard cutting element secured to said crown face;
- said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate extending laterally outwardly beyond said cutting edge.
2 more elements
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate extending laterally outwardly beyond said cutting edge.
A fixed-cutter rotary drag bit for drilling subterranean formations, comprising:
- a shank;
- a bit crown secured to said shank and having a face opposite thereto;
- and
- at least one superhard cutting element secured to said crown face;
- said at least one superhard cutting element comprising a substantially planar table of superhard material having a flat cutting surface and a cutting edge along at least a portion of the periphery of said cutting surface, and a supporting substrate to the rear of said superhard table, the outer lateral dimension of said substrate being substantially the same as that of said superhard table proximate said cutting edge and extending laterally outwardly therefrom from proximate said superhard table.
2 more elements
A cutting element for a rotary drag bit used in drilling subterranean formations comprising:
- a substantially planar table of superhard material, said superhard table having a flat cutting surface on one side thereof and a cutting edge bordering said cutting surface along at least a portion of the periphery thereof;
- and
- a substrate behind, secured to and supporting said superhard table at a side thereof opposite said cutting surface, said substrate being of substantially the same lateral extent than said superhard table proximate said cutting edge and increasing in lateral extent beyond said cutting edge.
Dependencies are inferred from the claim text.